To prepare 250mL of 0.100 M H2SO4, a student uses graduated pipette and a 250mL volumetric flask having uncertainty of ±0.02mL and ±0.1mL respectively. Calculate the volume of concentrated sulfuric acid 96% (±3) used and the uncertainty in 0.100M. dH2SO4 96 % = 1.84 (±0.05) g/mL FMH2SO4 = 98.079 g/mol
To prepare 250mL of 0.100 M H2SO4, a student uses graduated pipette and a 250mL volumetric flask having uncertainty of ±0.02mL and ±0.1mL respectively. Calculate the volume of concentrated sulfuric acid 96% (±3) used and the uncertainty in 0.100M. dH2SO4 96 % = 1.84 (±0.05) g/mL FMH2SO4 = 98.079 g/mol
Chapter27: Molecular Fluorescence Spectroscopy
Section: Chapter Questions
Problem 27.9QAP
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a) To prepare 250mL of 0.100 M H2SO4, a student uses graduated pipette and a 250mL volumetric flask having uncertainty of ±0.02mL and ±0.1mL respectively. Calculate the volume of concentrated sulfuric acid 96% (±3) used and the uncertainty in 0.100M.
dH2SO4 96 % = 1.84 (±0.05) g/mL
FMH2SO4 = 98.079 g/mol
b) If you want to prepare 1.00 L of buffer at pH 7.54 with a total phosphate concentration of 0.500 M, how many grams of each selected compounds below would you mix?
Given that: H3PO4 (FM 98.00), NaH2PO4 (FM 119.98), Na2HPO4 (FM 141.96), and Na3PO4 (FM 163.94)? Ka1 = 7.1 x 10-3; Ka2 = 6.3 x 10-8; Ka3 = 4.5 x 10-13
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